<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>

<div id="app">
    <h2 v-if="score>=90">优秀</h2>
    <h2 v-else-if="score>=80">良好</h2>
    <h2 v-else-if="score>=60">及格</h2>
    <h2 v-else>不及格</h2>

<!--  使用计算属性，推荐这种写法-->
  <h1>{{result}}</h1>
</div>

<script src="../js/vue.js"></script>
<script>
    const vue = new Vue({
        el:'#app',
        data:{
            score:99,

        },
        computed:{
            result(){
                let showMessage = '';
                if(this.score>=90){
                  showMessage = '优秀'
                }else if(this.score>=80){
                    showMessage = '良好'
                }else if(this.score>=60){
                    showMessage = '及格'
                }else{
                    showMessage = '不及格'
                }
                return showMessage;
            }
        }
    })
</script>

</body>
</html>